Antiferromagnetic magnons and local anisotropy: Dynamical mean-field study

• Autoři: NIYAZI Abuduaini; GEFFROY Dominique Alain; KUNEŠ Jan
• Rok publikování: 2021
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Physical Review B
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• www: https://doi.org/10.1103/PhysRevB.104.075152
• Doi: https://doi.org/10.1103/PhysRevB.104.075152
• Klíčová slova: Hubbard model; Spin dynamics; Antiferromagnets; Green's function methods; Magnetic order
• Popis: We present a dynamical mean-field study of antiferromagnetic magnons in a one-, two-, and three-orbital Hubbard model of square and bcc cubic lattice at intermediate coupling strength. We investigate the effect of anisotropy introduced by an external magnetic field or single-ion anisotropy. For the latter we tune continuously between the easy-axis and easy-plane models. We also analyze a model with spin-orbit coupling in cubic site-symmetry setting. The ordered states as well as the magnetic excitations are sensitive to even a small breaking of SU(2) symmetry of the model and follow the expectations of spin-wave theory as well as general symmetry considerations.

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